Camera-shutter.



E. TALLMADGE.

CAMERA SHUTTER.

APPLICATION FILED Nov. Is, I9I4.

1 1 99 V3 1 8 Patented Sept. 26, 1916.

F1 yl.

EDGAR TALLMADGE, OF MILWAUKEE, WISCONSIN.

CAMERA-SHUTTER.

Specification of Letters Patent.

Patented Sept. 26, 1916.

Application led November 18, 1914. Serial No. 872,688.

To all whom t may concern Be it, known that I, EDGAR TALLMADGE, a citizen of the United States, residing at Milwaukee, county of Milwaukee, and State of lVisconsin, have invented new and useful Improvements in Camera-Shutters, of which the following is a specification.

My invention relates to improvements in camera shutters.

The object of my invention is to provide means for more accurately controlling the movement and adjustment of the shutters, and-for dispensing with springs, weights and equivalent automatic devices, such as have heretofore been productiveof much annoy- `ance, and inaccuracy in operation. My invention, however, is adapted for usein connection with springs and equivalent devices, which may be yused as auxiliaries to insure quick reactive orshutter closing movements.

In the drawings-,Figure 1 is a front elevation of a shutter casing with parts partially broken away to expose the shutter curtains, and curtain rollersV and a pneumatically operated shutter actuating piston, the cylinder in whichv it operates, being shown in vertical section. Fig. 2 is a sectional view, drawn on line m-m of Fig. l. Fig. 3 is an end elevation, showing an exterior auxiliary spring applied thereto in operative relation to the curtain rollers.

Like parts are identified by the same reference characters throughout the several views.

A pairof curtain supporting rollers 1 and 2 are respectively mounted in a casing 3 above and below the exposure opening 4. The curtains 5 and 6 are wound upon these rollers and are provided with end hars 7 and 8, which partially overlap at the center of the exposure opening 11, when the curtains are in closed position. Flexible connections, such as the cords or wire stands 9, are wound about each roller at each end thereof and each has one end connected with the bar 7 (or 8) of the curtain carried by the opposing roller. The curtains are wound upon the rollers in one direction, and the cords leading ,from each bar extend about the end portions of the rollers in the opposite di- Y rection,V whereby the movement of either bar will be transmitted to the rollers, causing them to rotate in opposite directions, and moving the curtains inwardly or outwardly with reference to their meeting line. Guide rods or rollers 10 are preferably used to direct the cords and curtainsalong substantially straight lines and in proximity to each ether, whereby the extremities of the curtains which inclose the bars 7 and 8, will move into-and out of actual Contact at the center of the exposure opening.

One of the bars, (here illustrated as the bar 7), is extended and connected with a piston 1.1, which is adapted to reciprocate in a cylinder l2, the upper end of which may be slotted to permit the bar 7 to extend through the cylinderwall for connection with the piston 11. The latter is of suiiicient length to move to the full limit of its upward stroke without permitting air to escape through the slot from space below the piston. A flexible bellows 15, connected with the lower end of the cylinder 12 by a tube 1G, provides means for delivering a power fluid (preferably air) to the cylinder to actuate the piston and force it upwardly.

WVhen relieved from manual pressure, the

bellows expands automatically, (a rubber bulb being preferably employed), and the piston then descends by its own gravity and also by suction, since the expansion of the bellows exhausts air from the lower portion ofthe cylinder. The tube 16 may be of any desired length and the bellows may therefore be located either at a distance from the camera or in proximity thereto.

In Fig. 3, I have illustrated a coiled spring 19, which may if desired, be used as an auxiliary means for closing the shutter curtains. At one end, this spring is connected by a liexible connection 2.0 with the roller trunnion 21, and at the other end with a tension lever 22. This spring is not essential to my invention, and I prefer to dispense with it under ordinary conditions.

It will be observed that by my improved construction, the curtains are (at least primarily) actuated by Huid pressure in both directions, the upward movement of the piston being due to excess pressure in the cylinder over atmospheric pressure, and the downward movement of the piston being due principally to the excess pressure in the surrounding atmosphere over that in the cylinder below the piston.

1. A cameraV shutter curtain provided with a laterally extending projection, in combination with a fluid actuated member directly secured to said projection.

2. A camera shutter mechanism, including the combination of a cylinder, a piston therein, a shutter curtain, la curtain bar directly connected with the piston, and manually operable means for delivering fluid :to and withdrawing it from the cylinder.

v3. A camera shutter curtain, .provid-ed With a laterally extending terminal bar, in combination with a cylinder, having its upper portion provided With a guide slot receiving said bar, a piston in said cylinderconnected with said bar, and manually controlled means for deliverimg` fluid to and withdrawing' it from .said cylinder.

4. In a camera, the combination With a pair vol oppositeb7 movable shutter curtains, of means operative at both ends of each curtain Vroller for equalizing the movement of the curtains, and fluid pressure means for actuating one of the curtains in two directions.

5. The combination With a set of camera shutter curtain rollers, of a curtain Wound upon each of said rollers in one direction, a set of flexible motion transmitting members Wound upon each of said rollers in the opposite direction and connected With the curtain Wound -upon the other roller, alining guides for causing lboth the curtains and the flexible connections to converge between the rollers and occupyT substantially parallel positions between the guides, and in line With the roller axes whereby the margins of said curtains may be 'brought into actual Acontact when the curtains are partially unwound from ythe rollers, and means for actuating one of said curtains.

The combination with a set of camera shutter curtain rollers, of a curtain Wound upon `each vof said rollers in one direction, a set of flexible motion transmitting members Wound upon each of said rollers in the opposite direction and connected with the curtain Wound upon the other roller, alining guides for causingr the curtains and flexible connections to converge between the rollers and occupy substantially parallel positions 'between the guides, whereby the vmargins of said curtains may be brought -in-to actual contact in a -line between Ithe roller axes when the curtains are partially unwound from the rollers, and means for actuating one of said curtains, including a fluid actuated member connected thereto.

7. The combination with a camera shutter curtain and curtain roller', of a, uid actuated member directly connected with said curtain, an auxiliary spring having a 'ilexi-A ble connection with the curtain-roller -or actuating ,said curtain -in one direction, and a 'lever for varyingthe tension ofthe spring. In testimony whereof I affix my signature 'in the presence of two Witnesses. Y

EDGAR TALLMADGE. Witnesses:

Lnvnmsrr C. WHEEL-nn, IRMA D. Brum.

(Ippica of this pstentmqybe obtained for ive cents cach, byvsddrndng .the ommmiowm Intenta,

WuMngtom-nlc. 

